Centos7 k8s v1.5.2二进制部署安装-kubelet组件安装

一、部署kubectl服务

　　1、工作流程图

         

　　2、Kubelet组件运行在Node节点上，维持运行中的Pods以及提供kuberntes运行时环境，主要完成以下使命： 

　　　　１）监视分配给该Node节点的pods 
　　　　２）挂载pod所需要的volumes 
　　　　３）下载pod的secret 
　　　　４）通过docker/rkt来运行pod中的容器 
　　　　５）周期的执行pod中为容器定义的liveness探针 
　　　　６）上报pod的状态给系统的其他组件 
　　　　７）上报Node的状态

　　kubelet安装在node节点，我们的node跟apiserver在一起，这里安装在hdss7-21,22上：

　　首先，kubernetes依赖pause，我们先将此服务上传到们自己的docker私有仓库：

　　kubernetes中的pause容器主要为每个业务容器提供以下功能：

　　　　在pod中担任Linux命名空间共享的基础；

　　　　启用pid命名空间，开启init进程。

　　3、签发证书

vim /opt/certs/kubelet-csr.json
  {
    "CN": "k8s-kubelet",
    "hosts": [
      "127.0.0.1",
      "192.168.112.10",
      "192.168.112.22",
      "192.168.112.23",
      "192.168.112.24",
      "192.168.112.25"
    ],
    "key": {
      "algo": "rsa",
      "size": 2048
    },
    "names": [
      {
        "C": "CN",
        "L": "BeiJing",
        "ST": "BeiJing",
        "O": "od",
        "OU": "ops"
      }
    ]
  }

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=server kubelet-csr.json | cfssl-json -bare kubelet　

　　4、拷贝配置文件(22、23)

cd /opt/kubernetes/server/bin/cert/
scp operations:/opt/certs/kubelet.pem ./
scp operations:/opt/certs/kubelet-key.pem ./

　　 5、分发证书(22、23)

  # 设置集群参数
  kubectl config set-cluster myk8s 
  --certificate-authority=/opt/kubernetes/server/bin/cert/ca.pem 
  --embed-certs=true 
  --server=https://192.168.112.10:7443 
  --kubeconfig=kubelet.kubeconfig

  # 设置客户端认证参数
  kubectl config set-credentials k8s-node 
  --client-certificate=/opt/kubernetes/server/bin/cert/client.pem 
  --client-key=/opt/kubernetes/server/bin/cert/client-key.pem 
  --embed-certs=true 
  --kubeconfig=kubelet.kubeconfig

  # 设置上下文参数
  kubectl config set-context myk8s-context 
  --cluster=myk8s 
  --user=k8s-node 
  --kubeconfig=kubelet.kubeconfig

  # 设置当前使用的上下文
  kubectl config use-context myk8s-context --kubeconfig=kubelet.kubeconfig

cd /opt/kubernetes/server/bin/conf
scp operations:/opt/certs/kubelet.kubeconfig  ./

　　 6、创建k8s-node.yaml文件（22节点上：不论在哪个节点创建，已经同步到etcd上。）

vim k8s-node.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: k8s-node
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:node
subjects:
- apiGroup: rbac.authorization.k8s.io
  kind: User
  name: k8s-node

创建
kubectl create -f k8s-node.yaml
检测
kubectl get clusterrolebinding  k8s-node -o yaml

         

 　　7、在运维主机上

docker pull kubernetes/pause
docker tag f9d5de079539 harbor.od.com/public/pause:latest
docker push harbor.od.com/public/pause:latest

　　8、编辑kubelet启动脚本

vim /opt/kubernetes/server/bin/kubelet.sh
#!/bin/sh
./kubelet 
  --anonymous-auth=false 
  --cgroup-driver systemd 
  --cluster-dns 192.168.0.2 
  --cluster-domain cluster.local 
  --runtime-cgroups=/systemd/system.slice 
  --kubelet-cgroups=/systemd/system.slice 
  --fail-swap-on="false" 
  --client-ca-file ./cert/ca.pem 
  --tls-cert-file ./cert/kubelet.pem 
  --tls-private-key-file ./cert/kubelet-key.pem 
  --hostname-override slave3.host.com 
  --image-gc-high-threshold 20 
  --image-gc-low-threshold 10 
  --kubeconfig ./conf/kubelet.kubeconfig 
  --log-dir /data/logs/kubernetes/kube-kubelet 
  --pod-infra-container-image harbor.od.com/public/pause:latest 
  --root-dir /data/kubelet

chmod u+x /opt/kubernetes/server/bin/kubelet.sh
创建日志存储目录： mkdir -p /data/logs/kubernetes/kube-kubelet

　　9、编辑supervisord启动文件：红色部分自行修改

vi /etc/supervisord.d/kube-kubelet.ini

[program:kube-kubelet-7-62]
command=/opt/kubernetes/server/bin/kubelet.sh     ; the program (relative uses PATH, can take args)
numprocs=1                                        ; number of processes copies to start (def 1)
directory=/opt/kubernetes/server/bin              ; directory to cwd to before exec (def no cwd)
autostart=true                                    ; start at supervisord start (default: true)
autorestart=true                                  ; retstart at unexpected quit (default: true)
startsecs=30                                      ; number of secs prog must stay running (def. 1)
startretries=3                                    ; max # of serial start failures (default 3)
exitcodes=0,2                                     ; 'expected' exit codes for process (default 0,2)
stopsignal=QUIT                                   ; signal used to kill process (default TERM)
stopwaitsecs=10                                   ; max num secs to wait b4 SIGKILL (default 10)
user=root                                         ; setuid to this UNIX account to run the program
redirect_stderr=true                              ; redirect proc stderr to stdout (default false)
stdout_logfile=/data/logs/kubernetes/kube-kubelet/kubelet.stdout.log   ; stderr log path, NONE for none; default AUTO
stdout_logfile_maxbytes=64MB                      ; max # logfile bytes b4 rotation (default 50MB)
stdout_logfile_backups=4                          ; # of stdout logfile backups (default 10)
stdout_capture_maxbytes=1MB                       ; number of bytes in 'capturemode' (default 0)
stdout_events_enabled=false                       ; emit events on stdout writes (default false)

supervisorctl update
supervisorctl status

　　10、查看节点是否加到集群

kubectl get nodes
  NAME              STATUS   ROLES    AGE    VERSION
  slave3.host.com   Ready    <none>   101s   v1.15.2
  slave4.host.com   Ready    <none>   29s    v1.15.2

  
  kubectl label node slave3.host.com node-role.kubernetes.io/master=
  kubectl label node slave3.host.com node-role.kubernetes.io/node=
  kubectl label node slave4.host.com node-role.kubernetes.io/master=
  kubectl label node slave4.host.com node-role.kubernetes.io/node=

kubectl get nodes